Since this is HN: About 25% of US males wear a tungsten wedding band. So, not most, but a sizable amount.
https://www.jckonline.com/magazine-article/the-knot-2019-jew...
Since people tend to stay married for years, and tungsten wasn't as popular previously, the actual number of adult men wearing tungsten wedding bands is probably a lot lower, maybe around 10%.
Still a lot. Approximately nobody wears them in Germany; seems like an opportunity.